Reamer grinder



July 3, 1928. 1,675,858 F. A. LITTER REAMER GRINDER FiledOct. 27, 1925 11v NTOR. WWW u 0&4 321 6 m A TTORNEYS.

Patented July 3, 1928.

UNITED STATES PATENT OFFICE.

REAMER GRINDER.

Application filed October 27, 1926.

My invention relates to reamer grinders and has to do particularly with the provision of an apparatus for grinding or 7111;; the cutting flutes of straight and spiral reamers.

One object of my invention is the provision of a compact portable and selfcontained apparatus whereby the cutting flutes of straight and spiral reamers may be quickly and accurately ground to the required dimensions.

Another object of my invention is the provision of a reamer grinder having an attachment by means'of which spiral reamers may be ground and the reamer revolved in such a manner that the sharpening wheel operates upon the same flute throughout the length of its reciprocatory movement.

Another object of my invention is the provision of a novel device for maintaining a particular flute in fixed relation to the sharpening wheel, such devicealso being designed to permit the different flutes to be brought successively into sharpening position and rigidly held in such position during the grinding operation.

A still further object of my invention is the provision of an adjusting device by means of which my grinding apparatus may be adapted to sharpen reamers of different diameters.

Other objects of my invention will appear from the following detailed description and its various features are illustrated in the accompanying drawings wherein similar reference numerals designate corresponding parts in the several figures and wherein Figure 1 is a perspective view showing my novel reamer grinder, the relation and nature of its various parts and the manner of securing a reamer in operative relation to the granding mechanism.

Figure 2 is a fragmentary perspective view showing my novel reamer grinder equipped for operation upon the cutting flutes of a spiral reamer.

In the drawings, my invention is shown as comprising a base plate 1 which is preferably provided with ways or guides 2 and 3 on its opposite longitudinal edges. Blocks 4 and 5 are formed on the opposite ends of the base 1, and these blocks are adapted to carry the centering pins 6 and 7 by means of which the reamer to be ground is held in operative relation to the grinding Wheel hereafter described. The centering pins 6 Serial No. 144,602.

and 7 may be longitudinally adjusted and are held in any adjusted position by cap pieces 8 and 9 and stud bolts 10.

A carriage 11 which is formed with portions 12 and 13 cooperating with the ways or guides 2 and 3, is slidably mounted upon the base 1 and carries the grinding or sharpening apparatus. A plate 1 is pivoted to the carriage 11 as at 15, and at its opposite end said plate is provided with an adjusting screw 16 and locking nut 17. The adjusting screw 16 bears against the top surface of the carriage 11 and may be turned to oscillate the plate 14 about the pivot 15 to thereb Y adjust the grinding wheel vertically witi reference to the coincident axes of the centering pins 6 and 7. The adjustable plate let carries an electric motor 18 which is preferably directly connected to a removable grinding wheel 19. A stop 20 for limiting the reciprocatory movement of the carriage 11 is provided, and this stop 20 is adjustably positioned in a boss 21 by means of a set-screw 22. By suitably adjusting the stop 20, my grinding apparatus may be adapted to operate upon reamer flutes of different lengths. Removably secured to the side of the base plate 1 by means of a screw 23 is an adjusting socket 2a, and adjustably secured within this socket by means of a set-screw is a holding device 25 which removably and adjustably carries the shank 26 of a preferably flexible member 27 which is adapted to abut against one side of the particular flute of the reamer being ground.

In the operation or use of my invention in connection with the grinding of reamers having flutes parallel with the longitudinal aXis of the reamer, such reamer may be rotatably secured between aligned pointed ends of the centering pins 6 and 7. and the member 27 caused to engage in one of the grooves in the reamer to prevent rotation thereof and hold the flute being operated upon in fixed relation to the path of movement of the sharpening wheel 19. The grinding or sharpening wheel 19 may then be adjusted by means of the screw 16 according to the diameter of the particular reamer, and the stop 20 adjusted according to the length of the flutes of such reamer. The carriage 11 may now be reciprocated back and forth on the ways 2 and 3 to move the revolving grinding wheel 19 over the entire length of the particular cutter or flute being ground.

This operation may be repeated as often as "riage reciprocation is repeated. This operation is carried out upon each of the flutes V of the particular reamer being ground.

' During the grinding of the flutes of any particular reamer, the adjusting screw 16 preferably remains in its predetermined position 'to ensure that all flutes are equally and uniformly ground.

.lVhen grinding reamers having spiral flutes-such as shown in Figure 2, it is necessary' to revolve the reamer in synchronism with thelateral movement of the grinding wheel so that such wheel will operate the same cutter throughout its reciprocation.

For the purpose of revolving a spiral fluted reamer, I have provided a socket 50 which is adapted to be secured to the carriage 11 as at 51, instead of to the base 1, as is donewhen a straight reamer is being ground The socket 50 may be secured to the carriage 11 by a set-screw 52 engaging with the threaded opening 51. lVith the exception of its attaching portion, the socket 50 is similar to the socket 524 heretofore described and the holding device 25 is secured therein in the In using this attachment, the socket 24 is preferably removed from the base 1; the reamer mounted between the centering pins 6 and 7 the grinding wheel 19 adjusted by means of the adjusting screw 16; and then the carriage 11 is moved to the left (Figure 1). As the carriage 11 is moved, the member 27 engages in the groove adjacent the flute being operated upon and abuts against such flute, thereby traveling.

along with the carriage and revolving the reamer, so that the grinding wheel 19 conti'n'ues to operate upon the same flute Then the grindthroughout its movement. ing wheel has traversed the length of the flute being ground, the plate 14 may be lifted slightly to raise the grinding wheel out of contact with the flute and then the carriage 11 is slid back to its starting point. Each cutting flute of the reamer is ground in a similar manner. I prefer the above-dewhereby reamers of different sizes anddesigns may be ground after suitably adjusting the vertical position of the cutting wheel and the length of the path of reciprocation ofthe carriage.

Having thus described my invention, what I claim is:

' 1. In reamer grinding apparatus having a base and centering pins for holding the reamer on said base, a carriage slidable longitudinally of said base and'in parallelism with a reamer carried bysuch centering pins,

a motor support mounted upon said carriage,

a motor mounted upon said support and having its shaft disposed substantially at right angles to a reamer carried by the centering pins and a grinding wheel directly connected to the shaft of said motor to rotate in a iongitudinal vertical radial plane of the reamer gitudinally of said base and in parallelism with a reamer carried by such centering pins,

a motor support mounted upon said carriage, a motor mounted upon said support and having its shaft disposed substantially at right angles to a reamer carried by the centering pins and guiding wheel directly connected to the shaft of said motor to rotate in a longitudinal vertical radial 'plane of the reamer and grinding insubstantial parallelism with the longitudinal axis ofthe' reamer, said motor support'having one end pivoted to the carriage to adjust said wheel in said plane, and an adjusting screw at the other end of said motor support, said adjusting screw beingoperable to raiseor lower said grinding wheel with relation to a reamer carried by the centering pins of the grinding apparatus.

In testimony whereof I.:l1 ereby aflix my signature, I

; V FBEDERIOKAL'LITTERQ GERTEEE GATE 9F @JRRECTWN,

Paieni N0. 1;, 675, 85%

Patent Ohice.

F ugwsi, A. 32.

Signed and saahad Acting (Seal) 

